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Finding the Fourth Proportional to 992.65, 1,488.40 and 580.92

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Solution

The fourth proportional to 992.65, 1,488.40 and 580.92 is: 871.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.65 : 1,488.40 = 580.92 : x
  2. Step 2: Convert to fraction form
    992.65/1,488.40 = 580.92/x
  3. Step 3: Cross multiply
    992.65x = 1,488.40 × 580.92
  4. Step 4: Simplify right side
    992.65x = 864,643.38
  5. Step 5: Solve for x
    x = 864,643.38/992.65
  6. Step 6: Final answer
    x = 871.05

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.